Figure 2

Residuals vs. predicted values of three Linear Seemingly Unrelated Regression models (Eq. 2). The three predictors are: (a–c) dbh, (d–f) dbh2, and (g–i) dbh2·ht. Each LSUR model consists of three component ratio models (CRM) for the three biomass components: (a,d,g) main stem, (b,e,h) large branch, and (c,f,i) twig.